Thomas e



T. E'. ANDERBERG.

AUTOMATIC DRAFTREGULATORI APPLICATION FILED DEC. 21. 1918.

1,307,950, PatentdJune 24, 1919. f

LEE-.1. T; g

Qwumtoi ZED STATES PATENT OFFICE.

THOMAS E. ANDERBERG', 0F SANDY, UTAH, ASSIGIN' OB 0F ONE-THIRD T0 WALTER W. MOORE AND ONE-THIRD TO ALBERT I4. ANDERBERG, BOTH OF SALT LAKE CITY,

- UTAH.

AUTOMATIC DRAFT-REGULATQR. f

To all whom it may concern:

Be it known that I, Thomas E. ANDER- BERG, a citizen of the United States, residing at Sandy, in the county of Salt Lake an State of Utah,-have invented certain new and useful Improvements in Automatic Draft-Regulators; and I do declare the following to be a full, clear, and exact descripvision being made whereby the increased draft when the fire is burning violently will open the damper to admit fresh air into the smoke pipe, thus checking the draft and similarly checking the fire.

With the foregoin in view, the invention resides in the novel fe hereinafter fully described and claimed, reference bein made to the accompanying drawing wh ch forms a part of this application.

Figure 1 is a front elevation of the invention applied to a smoke pipe.

Fig. 2 is a side elevation.

Fig. 3 is a vertical section on the plane indicated by the line 3-3 of Fig. 1.

Fig. 4; is a detail elevation of the damper plate and its rock shaft.

Fig. 5 is a small. side elevation illustrating the manner in which the device may be applied to a stove rather than to the smoke all l'illl pipe.

In the drawing above briefly described the numeral 1 designates a vertically dlsposed plate which is curved in horizontal section to conform with the shape of the pipe P or stove S upon which it is to be employed, it

being intended that this plate shall be se" cured either to the pipe as seen in Figs. 1, 2 and 3, or directly to the stove as depicted in Fig. 5. Any suitable means, such as stove bolts 2, may be employed for attaching the plate 1 and since the plate in question will in most cases be of cast metal, only afew fas teners are required.

An opening 3 is formed in plate 1 for registration with a similar opening in the stove or pipe, and an arched cowl 4 is.

Specification of Letters Patent.

atures of construction Patented June 24, 1919.

Application filed December 27, 1918. Serial No. 268,559.

joined integrally to said plate and inclines downwardly and outwardly from the upper end and sides of the opening 3, said cowl having an open lower end 5 which inclines downwardly to the lower end wall 6 of the opening 3. The portion 7 of plate 1, directly beneath opening 3, inclines upwardly and inwardly and is straight along its upper edge to form the aforesaid. wall 6; and a rock shaft 8 is mounted parallel with and in closerelation to said wall, suitable bearings 9 be ing shown secured to the plate 1 for supporting said shaft, although other appropriate provision could well be made.

The shaft 8 is by preference formed of a single wire rod bowed between its ends to provide an upstanding projection 10, this projection contacting with the outer side of a sheet metal damper plate 11 which is located within and normally closes the open end of the cowl 4, said end being provided with anintegral, inwardly extending flange 12 against which the plate 11 normally seats. The plate 11 is provided with a central tongue 13 and with knuckles 1 1 on opposite sides thereof, said kuckles being clenched around the shaft 8 on opposite sides of the extension 10, while the tongue 13 is bent into angular relation with the'plate to abut the inclined portion 7 of the plate 1, so as to form a stop for limitin the inward or opening movement of sai plate. By the provision of the tion 10, the damper plate 11 may berigidly secured to the shaft 8 and by the same stamping operation which forms said knuckles, the tongue 13 is provided. These features thus assist in producing an extremely simple and inexpensive device. It may also be consid ered thatin order to provide a straight wall 6 for the openin 3, it is necessary that the part 7 of the p ate shall incline and it is highly advantageous to employ this inclined part in connection with the tongue 13, to

limit the opening of the damper.

Any preferred provision may be made for normally closing the damper, but in most instances one end of the shaft 8 will be bent downwardly to provide a crank arm 15 upon which a suitable weight 16 is threaded 0r adjustably mounted in any other suitable manner. By properly adjusting the weight the damper may be made to open automatically when the fire is burning as required Until the fire has reached a predetermined intensity, the damper will remain closed, but

when this occurs, the draft is sufliciently I expensive nature, yet that it will be highly efficient and desirable. Since probably the best results are obtained from the details shown and described, they may well be followed, but within the scope of the invention as claimed, numerous minor changes in size, proportion and other minor details may well be made.

What I claim is:

1. In an automatic draft regulator, a plate having means for securing it to a stove pipe and provided with an opening, an arched cowl inclining downwardly and outwardly from the upper end and sides of said opening, said cowl having an open lower end inclining downwardly to said plate and terminating at the lower end of said opening,

the portion of the plate directlybelow said opening inclining upwardly and inwardly and forming the lower end wall of said opening, a flange extending inwardly from said open lower end of said arched cowl, a damper within said cowl and normally contacting with the inner side of said flange, a rock shaft parallel with said lower end of the aforesaid opening and carrying said damper,.a weight on said shaft for controlling the opening of said damper, and a projecting stop on said damper adapted to strike said inclined part of said plate to limit the opening movement of said damper.

2. A structure as specified in claim 1; said rock shaft having an upstanding projection; said damperbeing stamped from sheet metal and having two knuckles and a tongue; said knuckles being clenched around said shaft on opposite sides of said projection and said tongue being bent into angular relation with said damperto form said step.

In testimony whereof I have hereunto set my hand.

THOMAS E. ANDERBERG. 

